Patchwork [3/3] tpm: add the crypto algorithm identifier to active_bank_info

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Submitter Roberto Sassu
Date Sept. 25, 2017, 11:19 a.m.
Message ID <20170925111950.21511-4-roberto.sassu@huawei.com>
Download mbox | patch
Permalink /patch/346291/
State New
Headers show

Comments

Roberto Sassu - Sept. 25, 2017, 11:19 a.m.
In preparation for the patch introducing a function to pass supported TPM
algorithms and digest sizes to TPM users, the crypto algorithm identifier
is added to the active_bank_info structure.

All members of active_bank_info are necessary: TPM algorithm identifiers
will be used to create an event log (they are included in the Crypto Agile
format defined by TCG); crypto identifiers will be used to calculate
digests using the crypto subsystem; digest sizes will be used to truncate
digests calculated with different algorithms.

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
---
 drivers/char/tpm/tpm2-cmd.c | 2 ++
 include/linux/tpm.h         | 1 +
 2 files changed, 3 insertions(+)
Jarkko Sakkinen - Oct. 4, 2017, 11:22 a.m.
On Mon, Sep 25, 2017 at 01:19:50PM +0200, Roberto Sassu wrote:
> In preparation for the patch introducing a function to pass supported TPM
> algorithms and digest sizes to TPM users, the crypto algorithm identifier
> is added to the active_bank_info structure.
> 
> All members of active_bank_info are necessary: TPM algorithm identifiers
> will be used to create an event log (they are included in the Crypto Agile
> format defined by TCG); crypto identifiers will be used to calculate
> digests using the crypto subsystem; digest sizes will be used to truncate
> digests calculated with different algorithms.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>

This should be in the patch set where it makes sense. Please remove it
from the next version.

/Jarkko

> ---
>  drivers/char/tpm/tpm2-cmd.c | 2 ++
>  include/linux/tpm.h         | 1 +
>  2 files changed, 3 insertions(+)
> 
> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> index b1356be..8c58f6e 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -946,6 +946,7 @@ static int tpm2_init_active_bank_info(struct tpm_chip *chip, u16 alg_id,
>  	int rc, i;
>  
>  	active_bank->alg_id = alg_id;
> +	active_bank->crypto_id = HASH_ALGO__LAST;
>  
>  	for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) {
>  		enum hash_algo crypto_algo = tpm2_hash_map[i].crypto_id;
> @@ -954,6 +955,7 @@ static int tpm2_init_active_bank_info(struct tpm_chip *chip, u16 alg_id,
>  			continue;
>  
>  		active_bank->digest_size = hash_digest_size[crypto_algo];
> +		active_bank->crypto_id = crypto_algo;
>  		return 0;
>  	}
>  
> diff --git a/include/linux/tpm.h b/include/linux/tpm.h
> index 3ecce21..fc927f3 100644
> --- a/include/linux/tpm.h
> +++ b/include/linux/tpm.h
> @@ -54,6 +54,7 @@ struct tpm_class_ops {
>  
>  struct active_bank_info {
>  	u16 alg_id;
> +	u16 crypto_id;
>  	u16 digest_size;
>  };
>  
> -- 
> 2.9.3
> 

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Patch

diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index b1356be..8c58f6e 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -946,6 +946,7 @@  static int tpm2_init_active_bank_info(struct tpm_chip *chip, u16 alg_id,
 	int rc, i;
 
 	active_bank->alg_id = alg_id;
+	active_bank->crypto_id = HASH_ALGO__LAST;
 
 	for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) {
 		enum hash_algo crypto_algo = tpm2_hash_map[i].crypto_id;
@@ -954,6 +955,7 @@  static int tpm2_init_active_bank_info(struct tpm_chip *chip, u16 alg_id,
 			continue;
 
 		active_bank->digest_size = hash_digest_size[crypto_algo];
+		active_bank->crypto_id = crypto_algo;
 		return 0;
 	}
 
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index 3ecce21..fc927f3 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -54,6 +54,7 @@  struct tpm_class_ops {
 
 struct active_bank_info {
 	u16 alg_id;
+	u16 crypto_id;
 	u16 digest_size;
 };